Write an application that prompts the user for a Write f = u + iv and assume that f has a derivative at each point of an open disk D centered at (0, 0). If au 2 + bv 2 is constant on D for some real a and b, not both 0, prove that f is constant on D.checking account balance and a savings account balance. Display the message “Checking account balance is low” if the checking account balance is less than $10. Display the message “Savings account balance is low” if the savings account balance is les